IP Telephony

　　Extreme Networks® innovative open network architecture delivers meaningful insight and unprecedented control for converged networks that support voice, video and data over wired and wireless infrastructures.

　　Extreme Networks solutions directly address the business objectives driving the change from legacy TDM systems to engaged network IP Telephony solutions and excel at delivering organization-wide availability, manageability, security, and excellent voice quality under the harshest network conditions.

　　Today's business objectives for organizations replacing legacy TDM, circuit switched voice PBXs with IP Telephony solutions include integrating phone systems across multiple locations, consolidating voice and data networks, reducing operational costs and deploying new applications to increase organization-wide connectivity and efficiency.

　　The benefits and features of solutions from Extreme Networks address the four key issues for converged infrastructures:

　　· Voice Class Availability–Robust performance in normal and hostile operating situations

　　· Integrated Management–Intuitive applications for cost-contained scalability

　　· Comprehensive Security–Network-wide coverage for risk reduction

　　· High Quality Voice Connections–Excellent voice clarity across proven contact center and enterprise architectures

　　Converged infrastructure solutions from Extreme Networks deliver powerful capabilities to solve the following tough networking challenges:

　　Voice Class Availability

　　· Predictable Operations—ExtremeXOS®, a modular operating system from edge to core, supports hitless software and hardware upgrades, secure networking, scalable operations, extensible functionality and flexible policy management.

　　· Preventing Dropped Calls—Ethernet Automatic Protection Switching (EAPS) enables 50ms link failover to standby switches.

　　· Hardware redundancy—Hot swappable cards, fans and power supplies. Power redundancy also supported.

　　Integrated Management

　　· Simplifying Adds, Drops and Changes––Link Layer Discovery Protocol (LLDP), the standard-based neighbor discovery protocol with MED extensions, configures and manages ports on an Extreme Networks network (PoE auto negotiation, Universal Port Manager).

　　· Discovery and Management––Extreme Networks and Avaya have undertaken joint development to coordinate AIM and EPICenter® management tools to discover and manage Avaya and Extreme Networks devices from either platform.

　　Comprehensive Security

　　· Virtualized Security Resources-Engaging the network to participate in security through Sentriant™ (rapid threat detection) and Sentriant AG (network access control). Sentriant works with the BlackDiamond® CLEAR-Flow security rules engine technology-a comprehensive, scalable and easy-to-use network-based security solution.

　　· Login-based Segregation with Cost Savings-Multiple supplicant support permits a phone to authenticate via its unique 802.1x supplicant or MAC address and, separately, a PC or other device connected via the phone's second Ethernet port to authenticate using its unique 802.1x supplicant or MAC address. Unique login/authentication permits network administrators to segregate and prioritize voice traffic from data traffic and halves the number of cabling runs and ports required on the network

　　· Network-based Segregation and Services Protection-Comprising VLANs, QoS, ACLs, IP Security (i.e., Trusted DHCP server, Gratuitous ARP identification, ARP Validation, Disable ARP learning, and Source IP Lockdown) and MAC limits.

　　High Quality Voice Connections

　　· Dial-tone Availability––Networks offers both Ingress/Egress QoS queuing with up to 8 queues per port for granular QoS functionality supporting dial-tone availability under high congestion conditions (Tolly Report, 2005).

　　· Path Visibility––Extreme Networks has embedded Avaya's Converged Network Analyzer (CNA) agents on all ExtremeXOS platforms. Deeper voice traffic monitoring and visibility into the network including auto-rerouting of voice calls over optimum WAN paths.

　　· Wireless Mobility––Extreme Networks Summit® WM products support voice-grade roaming on a wireless infrastructure.